I am installing a 6.2 into a Toyota Land Cruiser. It is a military take-out so I am missing alot of externals. My first queston,
On the passenger side head, on the back towards the firewall, there are 2 wires coming out, is this the temp switch, or does the switch plug into there? If this is not the switch, where is it and what does it look like?
I am also wiring my IP myself, there are 2 wires that go onto the IP, one on top by what looks like the fuel return line (that is another question I have, where does that hose go) and the other is more on the side. I think the top one is the fuel shut-off and the one more on the side is the fast idle?
There are also 2 wires coming out of the side of the IP just like the ones on the rear of the head, are these the wires for the fast idle?
Are all of these run on the same circuit, and do they have constant power?
My other question is the CDR? valve, or Tuna Can as I have heard it called. I don't have one on this engine. My question is, I have seem pictures of this engine on an Austrailian website where they do the conversions I am doing, and they eliminate the valve and just run a hose from the intake to the oil filler (basically just eliminate the valve) Is there a problem with doing this?
Thanks for your time, the sooner I figure all of this out the sooner I can get it on the road!
Rusty

That is the temp switch.

The fuel return line connects to the small return lines at the injectors and runs back to the fuel tank.

The one connection that is more towards the front of the IP is the fuel shutoff solenoid and it is supposed to have switched ignition power. The other one is the HPCA (Housing Pressure Cold Advance) solenoid. This advances the timing during a cold start to help the engine warm up faster. It is wired in parallel with the fast idle solenoid, which is mounted outside the injection pump on the driver's side. The fast idle and HPCA both have switched ignition power that runs through the temp switch.

The CDR (Crankcase Depression Regulator) valve is supposed to maintain a slight vacuum on the crankcase to help reduce leaks. I would recommend finding one, they are pretty cheap.

Ok, let me see if I have got all of this, the fuel outlet on top of the IP goes to the metal return line that the rubber hoses connect to and then run back to the fuel tank. The temp switch is the 2 wires coming off of the rear of the passenger cylinder head and it controls the HPCA and the fast idle selenoid. So I can run a hot wire (switched at the ignition) to the temp switch, continue with a wire to the fast idle then finish at the HPCA? The IP is grounded so that will complete the circuit, or is it not that simple? Seems like that will work if the temp switch shuts off at a certain temp that would also stop power to the fast idle and the HPCA.
Does the CDR have a hose that goes into the valve cover on the later models? Mine appears to be a later model but there is not a hole in the valve cover?
Thanks for your help
Rusty

Right. :exactly:

The late model (early 90s, last of the 6.2s) used a CDR valve that used a hole in the passenger side valve cover. The valve was different for those years in that it was made to mount differently. Have one laying around somewhere, I should take some pics to compare.

I am getting there, I am throwing in some pictures to make sure I have everything before I start wiring.
The first picture is of the IP and something going into the thermostat piping, just want to know what it is and if I have the wiring right on the IP.
The next picture is what I think is the temp switch?
The next picture is what could be water temperature?
The last picture I don't have a clue, it is a single wire coming out of the drivers side front of the head.
Hope these pictures help, I am anxious to get this wired and going!
Thanks - Rusty

My next question is about the ones with 2 wires. Is there a correct way to wire these, does it matter which way the power goes through them?
Rusty

Attached is an edited version of your one photo. I'm looking at the others now. Some of this stuff is a little different because you have a military engine.

Where do those wires go? They look like the wires for the military style temp switch but I can't see where they go...

Okay, here's another one. That's the military temp switch all right.

In this photo I'm guessing that's another temp switch although it isn't shown in the military manual.

http://www.dieselplace.com/forum/attachment.php?attachmentid=48748&d=1194456526

And here again I'm not sure. Possibly an oil pressure switch.

It would be helpful if someone who is more familiar with military stuff jumped in here. The military manual doesn't tell me much on electrical stuff.

http://www.dieselplace.com/forum/attachment.php?attachmentid=48750&d=1194456705

Here's the basics though. Wire up your IP with ignition power right now. I don't see a fast idle solenoid installed on your engine anyway so worry about the temp switch later, somebody here knows which switch to use (I'm guessing it's the one on the rear of the passenger side head, that's what it is on civilian models - I think the other one is for the military glow plug system which I'm not familiar with).

Does this help you any?

the military manual says thats a temp sending unit

And here again I'm not sure. Possibly an oil pressure switch.

It would be helpful if someone who is more familiar with military stuff jumped in here. The military manual doesn't tell me much on electrical stuff.

http://www.dieselplace.com/forum/attachment.php?attachmentid=48750&d=1194456705

Which page? I couldn't find it anywhere...

Does sound right though.

page 90 on my pdf file 2-71

http://www.dieselplace.com/forum/attachment.php?attachmentid=48748&d=1194456526

is the cold advance

Right you are. Also in that section it identifies the two wire switch on the rear of the righthand head as the temp switch for the cold advance system. Thanks for that!

i have been researching these alot because im buying all the stuff to put in my m880, its been awhile since i worked on a 6.2 :P

i bought a bellhousing for my swap today

Thanks for all the help, the two wires coming off of the IP go go the roller cam thing on the side of the IP, I assume that is the fast idle because when the throttle is moved by hand the cam turns on the roller and the 2 wires attach somewhere to that. Let me see if I have all this so far. The 2 wires on the passenger side rear head is a cold advance. What do I do with this or do I need it? (I live in Texas, usually not much below 35 and then not for long) The single wire on the drivers side front is the temp sending unit, that sends a signal to my guage so I need to find the wire in my Land Cruiser that goes to my temp guage. The military temp switch is near the thermostat.
Rusty

Ok, so assuming the 2 wires coming out of the IP are the fast idle my wiring will go like this.
Switched hot wire to the fuel shutoff.
Switched hot wire going from the temp switch to the fast idle and ending at the HPCA.
Wire from my temp guage to the temp sender.
Cold advance?
One more thing I am thinking about now, there is a rod connected to the throttle linkage on the IP that runs back in the V of the block towards the vacuum pump. I believe it may even connect somehow to the vacuum pump but I don't know. Any idea as to what this could be?
I assume the only thing I really need to hook up to get this running is the power to the IP and maybe the glow plugs?
It seems like there ought to be more, the accessories I can figure out since I am splicing into my Toyota harness for those. It will be nice to only have a handful of wires in the engine compartment!
Thanks again for all the help, these projects would not be as easy without people like you willing to help, I hope someday to be the one giving the answers!
Rusty

I am just thinking about the cold advance system, is it possible the military uses it instead of the fast idle switch? Could the wires on the cold advance system go to the wires in question on the IP?
Rusty

Let's clear a few things up about the fast idle/cold advance system.

On a stock, civilian 6.2 the fast idle solenoid is separate from the injection pump and mounted on the driver's side of the IP. It is grounded and wired in parallel with the cold advance (HPCA) solenoid and thus operates at the same time. The fast idle works in conjunction with the HPCA system to facilitate a faster warmup.

I don't know what that is that is installed on the side of your IP with the wires going to it but it isn't a fast idle system that I'm familiar with. Remember that military trucks were equipped with TH400 transmissions and therefore had vacuum regulator valves on the passenger side of the IP, but there's no wires involved with that... Did this engine come out of a HMMWV by chance?

Let me see if I can dig up a pic with the familiar civilian setup. Also somebody with a military truck might know...

that sounds like a kickdown rod for the HMMWV transmission

Here is a picture of the IP from the front of the engine. It gives you a little better idea of what I am talking about. If this is not the fast idle, what is it?
Rusty

it looks like a fast idle to me also i cant find it in the military manual though

i'm guessing here but could it be an early version of a kick down switch for a turbo 400.
my military 1984 has vacuum switch in that spot i believe is for trans vacuum.on the left side of the ip pump by the throttle cable is where my high idle solenoid is located.

its a HMMWV engine, so they have the 4L80E transmission and if i remember right it is all electric

That's not a fast idle solenoid. You don't have a fast idle solenoid installed. It's a switch, the question is what it is for... I can't say for sure.

throttle position sensor http://www.steelsoldiers.com/index.php?name=PNphpBB2&file=viewtopic&p=161036

The engine has a rod connected to the other side of the IP. It connects to the throttle and goes back towards the vacuum pump, I am assuming it is the kickdown rod?
So since we don't seem to know what this is, should I just buy a fast idle selenoid and remove this?
Thanks again
Rusty

The engine has a rod connected to the other side of the IP. It connects to the throttle and goes back towards the vacuum pump, I am assuming it is the kickdown rod?
So since we don't seem to know what this is, should I just buy a fast idle selenoid and remove this?
Thanks again
Rusty

I can't make out much from that photo. First of all, you need to ID the trans. The other comments posted about HMMWV trucks using 4L80E transmissions is not true. Yes, some late models use them after 1995 - but the rest of the HMMWVs use TH400 transmissions. The 1995 and newer A2 variants use 6.5 engines and 4L80Es - not the older 6.2 and 6.5 units.

In regard to having an odd-ball switch -I've seen many 6.2s rigged up that way. It's usually done when a truck is converted - from a 700R4 - to - a TH400. An electric switch is usually installed that gets tripped when you stomp on the throttle so it goes into kickdown mode.

If you do have the TH400 - you need someway of making it kickdown when you hit the pedal. It also needs either a regulated vacuum source (via a vacuum pump and a VRV on the injection pump) - or - a mechancial modulator.

I am hooking it up to a 700r4 in my 94 Land Cruiser. I am pretty sure it is a throttle position switch. The 2 wires go to a switch that is activated by a cam connected to the throttle, when the engine is near full throttle it hits a spot on the cam and the switch is activated, it must be for the trans. That being the case I think I can get rid of it with my 700r4 since I it will use a mechanical kick down. Where does the fast idle switch go and where is a good place to buy one?
Rusty

The solenoid you mean? I posted a pic showing the proper fast idle solenoid earlier. Your best bet with that is probably a used one at a junkyard or eBay. As I recall about the only place you can get them new is the dealer and they're expensive. If you do go for a used one try and get one you can test first. They do fail on occasion.

Right now I'm trying to find a stronger fast idle solenoid than the original. With the original one to set the fast idle you have to turn the key on and then press the throttle - it isn't strong enough to open the throttle by itself.

Ok, just ordered a fast idle selenoid and a temp switch, hopefully I can get this set-up like a civilian 6.2 so I will have a little better idea what everything is.
Rusty

I got my temp switch and it seems to mount in the same place as the military unit near the thermostat, I thought they were on the side of the block? It has two terminals, I suppose so long as it is getting the water temp it doesn't matter where it goes, it will be easy to wire into the fast idle where it is.
Rusty

I got my temp switch and it seems to mount in the same place as the military unit near the thermostat, I thought they were on the side of the block? It has two terminals, I suppose so long as it is getting the water temp it doesn't matter where it goes, it will be easy to wire into the fast idle where it is.
Rusty

Which temp switch are you talking about? There are two. Usually, the one that runs the temperature gauge goes into the side of one of the cylinder-heads. The other - a two-prong unit - depending on year - mounts on top into the water-manifold - or on the other cylinder head and serves as a glow-plug inhibitor. When it gets to a certain temp level - continuity is lost between the two terminals and glow plugs will no longer work.

The switch that operates the fast-idle and cold-advance differs depending on the year of 6.2. Most have it by the right-rear head bolt in the side of the head. It opens the circuit when it reaches 115 degrees F.
Some of the later 6.2s, especially in vans can have the sensors in various locations, and some of the later water-manifolds have two spots for sensors.

Right you are. Also in that section it identifies the two wire switch on the rear of the righthand head as the temp switch for the cold advance system. Thanks for that!
Going back to that photo, is the temp switch for the cold advance system the same thing as for the fast idle or do I need to order another switch. That is the one I thought I ordered but it turns out it must be the temp switch for the glow plugs. I thought the large thing on the other side of the thermostat was the temp switch for the glow plugs?
Rusty

Does anyone know if the military temp switch for their cold advance system will work for the civilian fast idle? The switch is in the same spot as the civilian cold advance switch and has 2 wires coming out of it, could be the same thing.
Rusty